CN203242392U

CN203242392U - Self-crosslinking physical foaming coaxial cable

Info

Publication number: CN203242392U
Application number: CN 201320281660
Authority: CN
Inventors: 王永忠; 洪向明
Original assignee: ZHEJIANG WANMA GROUP SPECIAL ELECTRON CABLE CO Ltd
Current assignee: ZHEJIANG WANMA GROUP SPECIAL ELECTRON CABLE CO Ltd
Priority date: 2013-05-21
Filing date: 2013-05-21
Publication date: 2013-10-16
Anticipated expiration: 2023-05-21

Abstract

A self-crosslinking physical foaming coaxial cable comprises an inner conductor, an insulating layer, an outer conductor and an outer sheath, wherein the inner conductor, the self-crosslinking foam insulating layer, the outer conductor and the outer sheath are sequentially arranged from inside to outside along the radial direction, and the inner conductor is a twisted bare copper wire or a solid copper wire or a copper-clad steel wire; the insulating layer is the self-crosslinking foam insulating layer; the outer conductor is formed by a single layer or multi-layer of tinned copper wire woven shielding layer; and the sheath is a polyvinyl chloride sheath. The insulating layer of the coaxial cable adopts the self-crosslinking foam insulating layer, improves the features of the coaxial cable such as temperature resistant level, heat resistance and welding resistance, compensates the shortcoming that ordinary polyethylene foam insulation is greatly after heating, and expands the applications of products; and the self-crosslinking foam insulating layer is good in mechanical strength, increases the pressure resistance, does not deform or form surface impression easily by the influence of subsequent processing, and can further improve the stability of electrical properties such as cable impedance and echo wave.

Description

A kind of self-crosslinking physically-foamed coaxial cable

(1) technical field

The utility model relates to coaxial cable technology, specifically a kind of self-crosslinking physically-foamed coaxial cable.

(2) background technology

Coaxial cable is generally formed by high/low density polyethylene mixed foaming, normal working temperature is 70 ℃, the highlyest be no more than 80 ℃, then need some special high temperature-resistant materials (such as fluoroplastics etc.) for the higher occasion of ask for something working temperature, but cost is high especially, needs simultaneously special equipment and explained hereafter.

(3) utility model content

In order to overcome the weak point of existing cable technology, the utility model provides a kind of self-crosslinking physically-foamed coaxial cable, greatly improved the characteristic such as temperature resistant grade, thermal endurance, anti-welding of cable, stablized product quality, and kept lower design cost.

For this reason, the utility model is taked following technical scheme:

A kind of self-crosslinking physically-foamed coaxial cable, include inner wire, insulating barrier, outer conductor and oversheath, described inner wire, self-crosslinking foaming insulation layer, outer conductor and oversheath radially arrange successively from inside to outside, and described inner wire is stranded bare copper wire or solid copper wire or copper covered steel wire; Described insulating barrier is the self-crosslinking foaming insulation layer; Described outer conductor is that single or multiple lift tinned copper wire woven shield forms; Described sheath is pvc sheath.

The utility model has the advantages that: insulating barrier adopts the self-crosslinking foaming insulation layer, has improved the characteristics such as temperature resistant grade, thermal endurance, anti-welding of coaxial cable, has remedied the larger shortcoming of common polythene foamed insulation temperature distortion, has expanded the application scenario of product; Self-crosslinking foaming insulation layer mechanical strength is good, has improved crushing resistance, is not easy to be subject to the impact of following process and is out of shape or forms the impression on surface, can further improve the stability of the electric properties such as cable resistance, echo.

(4) description of drawings

Fig. 1 is the structural representation of the utility model cable;

Wherein, 1-inner wire, 2-self-crosslinking foaming insulation layer, 3-outer conductor, 4-oversheath

(5) specific embodiment

A kind of self-crosslinking physically-foamed coaxial cable, include inner wire 1, insulating barrier 2, outer conductor 3 and oversheath 4, described inner wire, self-crosslinking foaming insulation layer, outer conductor and oversheath, radially arrange from inside to outside successively, described inner wire is stranded bare copper wire or solid copper wire or copper covered steel wire; Described insulating barrier is the self-crosslinking foaming insulation layer; Described outer conductor is that single or multiple lift tinned copper wire woven shield forms; Described sheath is pvc sheath.

The concrete production process of described self-crosslinking physically-foamed coaxial cable is as follows:

The first step selects the polythene material of the DGDA1253 trade mark and crosslinking agent (trade mark is DCP), cross-linked graft agent (trade mark is silane A171) with certain proportion mixing roll mixing granulation, to make grafted material; The part by weight of polyethylene, crosslinking agent, cross-linked graft agent is: 100:0.09:0.20.Melt index after the grafting is about 3.5.

Second step selects the polythene material of the DGDA1253 trade mark and catalyst to carry out mixing granulator with certain proportion, makes catalyst masterbatch; The part by weight of polyethylene and catalyst is: 100:1.60.Catalyst is a kind of di lauric dibutyl alkene.

The 3rd step mixed with certain proportion the above-mentioned grafted material that makes, catalyst masterbatch and suitable high density polyethylene (HDPE) (trade mark is DGDA6944), nucleator with blender, nucleator then adopts Celogen Az, and the trade mark is AC3000.The part by weight of grafted material, catalyst masterbatch, high density polyethylene (HDPE), nucleator is 100:0.50:100:0.00050.

The 4th step, the compound that the 3rd step prepared is produced insulation core wire at the physical blowing board, produce good insulated wire cores and placed 1-2 days, automatically finish cross-linking process.The important technical parameter of physical blowing has: die pressure: 13.7MPa, engine speed: 50 rev/mins, hauling speed: 40 rev/mins, water capacitance: 52 ± 1pF/m, main frame respectively distinguish temperature/℃: 143//185//225//225//225//190//195//199, speed of production: 120 m/mins.

In the 5th step, outside crosslinked good physical foam insulation heart yearn, make the outer conductor screen.

In the 6th step, the semi-finished product that shielding is good are finished the production of sheath.

Like this, the self-crosslinking physically-foamed coaxial cable completes.

RG6 specification self-crosslinking physically-foamed coaxial cable by aforementioned production method makes includes inner wire, self-crosslinking foaming insulation layer, outer conductor and oversheath, and described inner wire 1 is the copper covered steel wire of 1.02mm diameter; The foamed insulation of described self-crosslinking foaming insulation layer 2 for making with above-mentioned first to fourth one step process, diameter 4.54mm, foam degrees are 64%; Described outer conductor 3 is comprised of individual layer tinned copper wire woven shield, and braiding structure is 7 * 16 * 0.127mm; Described sheath 4 is pvc sheath, meets ROHS environmental requirement and UL specification requirement, and finished diameter is 6.84mm.Described inner wire, self-crosslinking foaming insulation layer, outer conductor and oversheath radially arrange successively from inside to outside.

This product has good heatproof characteristic and soldering resistance, improves product electric property and stability, and has lower design cost.The below is the self-crosslinking physically-foamed coaxial cable of RG6 specification and the performance comparison sheet of conventional RG6 coaxial cable.

Sequence number	Project	Conventional RG6 physically-foamed coaxial cable	Self-crosslinking physical blowing RG6 coaxial cable
				1	The stability of foaming	Good	Good, more stable
2	Dielectric strength	Generally	Improve, toughness and intensity all are improved
				3	The stability of impedance	Good	Better
4	Return loss	Good	Better, integral body improves 2-5dB
				5	Thermal endurance	General anti-70 ℃	Can tolerate 120 ℃, or higher
6	The feasibility of operation	Convenient	Convenient

Claims

1. self-crosslinking physically-foamed coaxial cable, include inner wire, insulating barrier, outer conductor and oversheath, it is characterized in that: described inner wire, self-crosslinking foaming insulation layer, outer conductor and oversheath, radially arrange from inside to outside successively, described inner wire is stranded bare copper wire or solid copper wire or copper covered steel wire; Described insulating barrier is the self-crosslinking foaming insulation layer; Described outer conductor is that single or multiple lift tinned copper wire woven shield forms; Described sheath is pvc sheath.